EP0654897A1 - Automatische Verstärkungsrepelung in Funkempfänern - Google Patents

Automatische Verstärkungsrepelung in Funkempfänern Download PDF

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Publication number
EP0654897A1
EP0654897A1 EP94402576A EP94402576A EP0654897A1 EP 0654897 A1 EP0654897 A1 EP 0654897A1 EP 94402576 A EP94402576 A EP 94402576A EP 94402576 A EP94402576 A EP 94402576A EP 0654897 A1 EP0654897 A1 EP 0654897A1
Authority
EP
European Patent Office
Prior art keywords
attenuator
memory
demodulation
chain
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94402576A
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English (en)
French (fr)
Other versions
EP0654897B1 (de
Inventor
Serge Chadeyron
Jean Delannoy
Jean Delecrin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0654897A1 publication Critical patent/EP0654897A1/de
Application granted granted Critical
Publication of EP0654897B1 publication Critical patent/EP0654897B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/04—Details
    • G01S3/043—Receivers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/001—Digital control of analog signals

Definitions

  • the present invention relates to an automatic gain control device in a radio frequency reception chain.
  • the automatic gain control device makes it possible to ensure gain regulation in order to obtain at the output of the chain an acceptable signal level independent of the level of the signal applied to its input.
  • the automatic gain control device conventionally acts directly on the gain of the amplifiers or on voltage-controlled attenuators. However as these act permanently according to the level of signal detected in the bandwidth of the receiver, it is generally not possible to know with precision the value of the gain at every moment in direction-finding in particular, where it would be desirable to be able freeze the gain of the receivers during the acquisition period of a program, this period being more or less long depending on the nature of the signal processing operations to be carried out.
  • the object of the invention is to overcome the aforementioned drawbacks.
  • the subject of the invention is an automatic gain control device in a radio frequency reception chain comprising, an HF reception head coupled to a demodulation chain by means of a programmable attenuator, characterized in that on the one hand, a memory of attenuation values addressed by the level of the signal applied to the input of the demodulation chain and coupled by its data outputs to the control inputs of the programmable attenuator, and d 'on the other hand a switch interposed in series between the attenuator and the demodulation chain of the attenuator to isolate the demodulation chain of the attenuator during the programming of the attenuator by the attenuation value addressed in the memory.
  • the advantage of the invention is that it allows for direction-finding applications in particular to maintain the amplification gain of radio channels in a stable manner during the acquisition period.
  • the automatic gain control device which is shown in the single figure inside a closed line in dotted lines 1 is coupled to a receiver 2 comprising in known manner an HF head 3, a frequency mixer 4 , a programmable attenuator 5, an HF filter 6 and a demodulation chain 7.
  • the device 1 comprises a logarithmic amplifier 8, a peak detector 9, a blocking sampler 10, a digital analog converter 11 and a memory of attenuation values 12 possibly formed by a programmable read only memory.
  • the elements 8 to 12 are connected in this order in series between the output of the filter 6 and a control input of the attenuator 5.
  • a digital signal processing block 14 is coupled on the one hand, to the output of the chain demodulation 7 and on the other hand, a data bus 15 coupled to the memory 12 and to control inputs of the programmable attenuator 5.
  • the block 14 also provides, by a command line 16, the control of the sequencer 13.
  • the sequencer 13 controls the blocking sampler 10, the analog-digital converter 11, the memory read cycles 12 as well as a switch or relay 17 placed in series between the output of the attenuator 5 and the input of the filter 6 .
  • the operation is as follows. At each request for positioning in a determined frequency band of the receiver 2 by the processing block 14, a control word is applied, at a time t1, to the data line 16 to control the sequencer 13. Upon receipt of this word the sequencer 13 invalidates the analog-to-digital converter 11 and controls the switch 17 to open the link between the output of the attenuator 5 and the input of the filter 6. At time t1, the value of the attenuation in the attenuator 5 is adjusted so that the signal level between the input of the HF head and the output of the modulation chain 7 is approximately the same. At a time following t2, the switch 17 is controlled to connect the output of the attenuator 5 with the input of the filter 6.
  • the value memorized in the blocking sampler 10 is first set to zero before memorizing the amplitude again peak of the signal leaving the filter 6.
  • the peak value of the signal memorized by the blocking sampler 10 is converted by the analog-to-digital converter 11, and the binary value obtained is applied to address lines of the memory 12.
  • each address line of the memory 12 is stored an attenuation value of the attenuator 5, each binary value obtained at the output of the analog-digital converter 11 selects an attenuation value in the memory 12, and this attenuation value is applied to corresponding control inputs of the attenuator 5.
  • the control of the attenuator takes place only after opening of the switch 17, so that no signal can be tr ansmis to the processing block 14 during the programming of the attenuator.
  • the switch 17 is again closed, and the control of the sequencer on the line 16 is removed, so as not to disturb the reception of the signals at low level.
  • the attenuation value of the attenuator 5 is transmitted on the bus 15 to the processing block 14, which can thus use this value for the analysis and processing of the signals from identical receivers in the acquisition phase of signal in multi-channel direction finders connected to the same antenna assembly.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Control Of Amplification And Gain Control (AREA)
EP19940402576 1993-11-19 1994-11-15 Automatische Verstärkungsregelung in Funkempfängern Expired - Lifetime EP0654897B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9313879A FR2712750B1 (fr) 1993-11-19 1993-11-19 Dispositif de commande automatique de gain dans une chaîne de réception radiofréquence.
FR9313879 1993-11-19

Publications (2)

Publication Number Publication Date
EP0654897A1 true EP0654897A1 (de) 1995-05-24
EP0654897B1 EP0654897B1 (de) 1999-01-13

Family

ID=9453054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940402576 Expired - Lifetime EP0654897B1 (de) 1993-11-19 1994-11-15 Automatische Verstärkungsregelung in Funkempfängern

Country Status (3)

Country Link
EP (1) EP0654897B1 (de)
DE (1) DE69415941T2 (de)
FR (1) FR2712750B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2918821B1 (fr) * 2007-07-10 2009-11-20 Thales Sa Attenuateur selectif en frequences

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786506A (en) * 1972-03-10 1974-01-15 Hughes Aircraft Co Dynamic range control system
JPS5621077A (en) * 1979-07-30 1981-02-27 Toshiba Corp Automatic radio direction finder
EP0148672A1 (de) * 1983-12-13 1985-07-17 Thomson-Csf Gemäss dem Einfallzeitabweichungsprinzip arbeitendes Einkanalfunkpeilgerät angepasst an amplitudenmodulierte Signale vom A3J- oder A1-Typ
US4683386A (en) * 1983-07-26 1987-07-28 Nec Corporation Electronic attenuation value control circuit in which switching noise is suppressed
JPS6375684A (ja) * 1986-09-19 1988-04-06 Toshiba Corp 無線方位表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786506A (en) * 1972-03-10 1974-01-15 Hughes Aircraft Co Dynamic range control system
JPS5621077A (en) * 1979-07-30 1981-02-27 Toshiba Corp Automatic radio direction finder
US4683386A (en) * 1983-07-26 1987-07-28 Nec Corporation Electronic attenuation value control circuit in which switching noise is suppressed
EP0148672A1 (de) * 1983-12-13 1985-07-17 Thomson-Csf Gemäss dem Einfallzeitabweichungsprinzip arbeitendes Einkanalfunkpeilgerät angepasst an amplitudenmodulierte Signale vom A3J- oder A1-Typ
JPS6375684A (ja) * 1986-09-19 1988-04-06 Toshiba Corp 無線方位表示装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 303 (P - 746) 18 August 1988 (1988-08-18) *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 73 (P - 61) 15 May 1981 (1981-05-15) *

Also Published As

Publication number Publication date
DE69415941T2 (de) 1999-05-27
EP0654897B1 (de) 1999-01-13
FR2712750B1 (fr) 1995-12-22
DE69415941D1 (de) 1999-02-25
FR2712750A1 (fr) 1995-05-24

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